JPH0731254U - Numerical control device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the axis movement does not involve a skip function, the axis movement can be stopped by the detection signal from the contact-type detector, which allows automatic measurement work without damaging the contact-type detector. Provided is a numerical control device capable of performing. [Numerical value having a skip function for executing a process by an instruction of each block of a program, forcibly stopping the process by a skip signal Sg1 input from an external contact detector 2, and shifting to a process of a next block When the skip signal Sg1 is input to the control device 1, the skip condition determining means 10 for determining whether or not the skip function G code (skip instruction) exists in the block being executed, and the skip function G code are provided. And an axis control unit 7 that performs an axis stop process when it does not exist.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a numerical control device that performs automatic measurement based on a contact signal from a contact-type detector (hereinafter referred to as a skip signal). More specifically, when the skip signal is input to the block, The present invention relates to a numerical control device that prevents damage to the detector even if there is no skip command.

[0002]

[Prior art]

 Numerical control devices used in NC machine tools and coordinate measuring machines have an automatic measurement function that automatically measures the dimensions of objects and tools to be measured. For example, in a machining center, skip to the same block of a program. By placing a function G code (skip command) followed by a command for axis movement, a contact type detection mounted on a spindle that moves relative to the table is fixed to a work mounted and fixed on the table. The main shaft relative to the main shaft at a predetermined feed speed (a low feed speed within a range where the output timing of the skip signal does not vary) to bring them into contact with each other, thereby inputting the skip signal to the control device. Then, based on the control axis coordinates at the time of contact, calculation processing of the work size, work coordinate correction fee, etc. is performed as necessary, and the execution of the axis movement command is stopped. Skip of the directive block.

When the skip function as described above is used, the axis movement becomes the above-mentioned predetermined low feed rate, and it takes time accordingly. Therefore, conventionally, in order to shorten the axis movement time and perform measurement work efficiently, the contact type detector is approached as fast as possible to the vicinity of the measurement point of the DUT (preliminary positioning), followed by a skip function. I was programmed to issue an axis move command.

[0004]

[Problems to be solved by the device]

 However, in the conventional numerical control device described above, if the approach point (target command position) before the axis movement accompanied by the skip function is programmed close to the measurement point of the DUT, the approach may occur due to installation error of the DUT. The contact-type detector may come into contact with the object to be measured during the axis movement at, and even in this case, the contact-type detector is positioned by the rapid feed to the approach point of the target command position without stopping the axis movement. There was a problem of breaking.

In addition, there is a possibility that the same problem as described above may occur due to an input error in the G code for the skip function, the target command position coordinate, etc. in the program creation.

The present invention has been made in view of the above-mentioned conventional problems, and even if an axis movement command without a skip function is used, the axis movement can be stopped by a skip signal from the contact type detector. Therefore, it is an object of the present invention to provide a numerical control device capable of performing automatic measurement work without damaging the contact type detector.

[0007]

[Means for Solving the Problems]

 The present invention executes a process by the instruction of each block of the program, and also has a skip function that forcibly cancels the process by the skip signal input from the external contact detection means and shifts to the process of the next block. In the control device, when the above skip signal is input, skip condition judging means for judging whether or not a skip command exists in the block being executed, and axis movement when it is judged that no skip command exists. It is characterized in that it is provided with axis control means for outputting an axis stop command for stopping.

[0008]

[Action]

 According to the numerical controller of the present invention, when the contact detecting means detects the contact of the contact detector with the object to be measured, and when the contact detecting means outputs a skip signal to the skip condition judging means, The condition judging means judges whether or not there is a skip command in the block being executed, and if not present, the axis control means carries out the axis movement stop processing. If there is a skip command, normal skip processing is performed.

As described above, when the skip signal is input from the contact detection means, the axis movement is stopped when the skip command does not exist in the block being executed. It is possible to avoid damage to the contact detection means due to input errors in programming, and to safely and reliably perform automatic measurement work.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 5 are views for explaining a numerical controller according to an embodiment of the present invention. FIG. 1 is a block diagram showing a basic configuration of the controller, and FIG. 2 is a condition judgment of the controller. FIG. 3 is a flow chart for explaining the processing procedure of the control section, FIG. 3 is a flow chart for explaining the processing procedure of the program analysis section of the control device, and FIG. 4 is a measurement created by adding a G code for skip function. FIG. 5 is a schematic diagram for explaining the operation of the program of FIG. 4, and FIG.

In these figures, reference numeral 9 denotes a column triaxial movement type measuring instrument, on the bed 91, a saddle 92 and a column 93 are used, and a known touch probe (contact type detector) 2 is attached to the tip. The detector holding shafts 94 mounted with are supported so as to be movable in three orthogonal directions (X axis, Y axis, Z axis). The touch probe 2 is moved and driven by a numerical control device 1 described later via a ball screw 95 arranged on each of the above-mentioned shafts and a shaft driving motor 6, and is mounted and fixed on a table 96. It is configured to generate the skip signal Sg1 by touching the measurement object 97.

The numerical control device 1 includes a program storage unit 3, a program analysis unit 4, a condition determination unit 5, an axis control unit 7, an alarm display unit 8, and a coordinate calculation unit (not shown). The storage unit 3, the program analysis unit 4, and the condition determination unit 5 implement the skip condition determination means 10 of the present invention, and the axis control unit 7 implements the axis control means of the present invention. The skip condition determining means and the axis control means are realized by software or hardware.

The numerical controller 1 causes the touch probe 2 to contact an arbitrary measurement position of the object to be measured 97 by executing a process in accordance with an instruction of each block of the measurement program, and the touch probe 2 The coordinate position of each measurement position is stored by the coordinate calculation unit based on the skip signal Sg1 from 2 and the calculation processing of the dimension of the DUT 97 is performed as necessary, or the skip signal Sg1 is used to force the calculation. It has a skip function to stop processing and move to the processing of the next block.

The program storage unit 3 stores measurement program data created in advance by an external program creation device or the like, and is composed of, for example, a semiconductor memory or a magnetic storage medium. As shown in FIG. 4, the measurement program data is composed of a plurality of blocks. G90 and M30 of the program start and end blocks (N1 and N9) are the absolute coordinate command definition G code and program, respectively. The M code for termination is shown.

In addition, in the block (N5) that performs the measurement operation, a skip command (skip function G code G31) that shifts to the process of the next block (N6) by the skip signal Sg1 generated from the touch probe 2 is provided. , Axis movement command (X100.0) is added. Further, before and after the block N5, a fast-forwarding axis movement command G code (G00) for increasing the movement speed is added together with the axis movement command (X0.0).

The axis movement command (X100.0) is to the target command position of X = 100 shown in FIG. 5, and the command (X0.0) is to the approach position of X = 0 in FIG. These are axis movement commands respectively, and the processes of (A) and (B) of FIG. 4 correspond to the operations of A and B of FIG. 5, respectively.

The program analysis unit 4 sequentially analyzes and executes the measurement program data input from the program storage unit 3 in block units by a so-called interpreter method (sequential execution method), and each unit described above. The command is output to. Specifically, if the above-mentioned skip function G code (G31) is confirmed in the execution block in the program data, the skip command Sg3 is sent to the condition judgment unit 5, and if the axis movement command is confirmed, the axis control unit 7 is sent to the axis control unit 7. The movement command Sg6 is output. When the skip execution command Sg7 and the axis stop command Sg4 of the condition judgment unit 5 described later are confirmed, the processing of the execution block is stopped, and in the case of the skip execution command Sg7, the analysis / execution of the next block, that is, the skip processing is executed. Is configured to do.

The condition determination unit 5 is for making a basic determination of a skip condition, and determines the skip command Sg3 from the program analysis unit 4 and the skip signal Sg1 from the touch probe 2 to determine the condition. Is satisfied (when the skip signal Sg1 is input at the time of the skip command), the skip execution command Sg7 is output to the program analysis unit 4 and when the condition is not satisfied (the skip signal Sg1 is input outside the time of the skip command). It is configured to output the axis stop command Sg4 to the program analysis unit 4 and the axis control unit 7 respectively, and to output the alarm display command Sg9 to the alarm display unit 8 when it is performed.

The axis control section 7 drives the axis based on the axis movement command Sg6 from the program analysis section 4 and the feedback signal Sg5 from the rotation detector of the shaft end of the axis driving motor 6 described above. The motor 6 is driven to rotate, the touch probe 2 is positioned according to the axis movement command Sg6, and the axis stop command Sg4 from the condition judgment unit 5 is judged to stop the driving motor 6. There is.

The alarm display unit 8 judges the alarm display command Sg9 from the condition judgment unit 5 and executes a skip function due to a mounting error of the object to be measured 97 on the table 96 or a measurement program creation miss. The operator is visually or audibly alerted by a CRT or a buzzer that the touch probe 2 has come into contact with the object to be measured 97 while the shaft is not moving.

Next, the function and effect of this embodiment will be described. When a program execution command is input to the numerical controller 1 from the outside, execution program data is input from the program storage unit 3 to the program analysis unit 4, and the analysis unit 4 sequentially analyzes each block unit.・ Execute and output the command corresponding to the above program to each part and perform the processing.

First, the operation of the condition determination unit 5 will be described with reference to FIG. During the processing by the program analysis unit 4, the condition determination unit 5 constantly monitors the input of the skip signal Sg1 from the touch probe 2 (step S1). When the touch probe 2 is moved by the axis movement command Sg6 from the program analysis unit 4 and comes into contact with the DUT 97, and the skip signal Sg1 is input to the condition determination unit 5, the program analysis unit 4 is input. The presence or absence of the G code for the skip function in the execution block is determined by the skip command Sg3 (step S2). When it is determined that the G code for the skip function is not commanded, the axis stop command Sg4 is output to the program analysis unit 4 and the axis control unit 7 (step S3), and the program analysis is performed by the axis stop command Sg4. The section 4 stops the execution block processing, and the axis control section 7 stops the driving control axis 6. Further, the condition determination unit 5 outputs an alarm display command Sg9 to the alarm display unit 8 (step S4), and the alarm display unit 8 causes the touch probe 2 to contact the DUT 97 during axis movement without the skip function. Warn the operator of contact.

In step S2, when the skip command Sg3 is input from the program analysis unit 4, the skip execution command Sg7 is output to the program analysis unit 4 (step S5), and the measurement is performed by the coordinate calculation unit (not shown). The coordinate position of the position is calculated, and the dimension or the like of the workpiece 97 is calculated from the coordinate position if necessary. When the skip execution command Sg7 is input, the program analysis unit 4 stops the normal skip processing, that is, the processing of the execution block and starts the analysis / execution of the next block.

Next, a program processing procedure of the program analysis unit 4 which receives each command from the condition determination unit 5 will be described with reference to FIG. The program analysis unit 4 sequentially analyzes and executes the measurement program data stored in the program storage unit 3 in block units (step S11), and skips from the condition determination unit 5 until the execution block processing is completed. The execution command Sg7 and the axis stop command Sg4 are repeatedly determined (steps S12 and S13), and when the skip execution command Sg7 is input, the processing of the execution block is stopped and the analysis / execution of the next block is started (step S11). When the axis stop command Sg4 is input, the execution block processing is stopped (step S16). When the processing of the execution block is completed (step S14), if the program is not completed (step S15), the processing of the next block is started (step S11).

Next, the operation of the above device will be described with reference to FIGS. When the program shown in FIG. 4 is read and executed by the program analysis unit 4, first, in block N1, the value of the axis movement command of the following block is defined in absolute coordinates. Then, in the block N4 before the measurement work, the touch probe 2 is fast-positioned at the approach position of X = 0 shown in FIG. Next, in block N5, the touch probe 2 is actuated toward the target command position of X = 100 in the direction of FIG. 5A. When the touch probe 2 reaches the skip position of FIG. The skip signal Sg1 is input to the condition determination unit 5 (see step S1 in FIG. 2). Here, since the block N5 is provided with the skip command G code (G31), the skip function operates (steps S1, S2 and S5 in FIG. 2), and the process immediately shifts to the block N6 to perform the touch probe. 2 is fast-forwarded to the approach position shown in FIG. 5B.

If the G code (G31) does not exist in the block N5 due to a mistake in creating a program, the touch probe 2 is stopped by the axis stop command Sg4, as shown in step S3 of FIG. If the touch probe 2 comes into contact with the DUT 97 while the block N4 is moving and the skip signal Sg1 is input due to an attachment error or the like, there is no skip command in this block N4. Also in this case, the touch probe 2 is stopped.

As described above, in the present embodiment, the numerical controller 1 is provided with the condition judging unit 5, and when there is no skip command in the program when the contact type detector 2 contacts the object to be measured 97, the above condition judging is made. Since the part 5 outputs the axis stop command Sg4 to stop the processing, the mounting position of the object to be measured 97 when the approach position of X = 0 is programmed close to the object to be measured 97. It is possible to avoid damage to the detector 2 due to the error. In addition, damage to the contact type detector 2 due to mistakes such as erroneous writing of a skip command of the program can be similarly avoided.

In the above embodiment, an example in which the present invention is applied to a three-dimensional measuring instrument has been described, but the numerical control device of the present invention is not limited to this. Any device that performs measurement work using axis movement with a skip function, such as a workpiece measuring device that is equipped with a measuring probe attached to a replaceable spindle or a tool length measuring device that uses a table mount sensor. Applicable.

[0029]

[Effect of device]

 As described above, in the numerical control device according to the present invention, when the skip signal is output from the contact type detector when there is no skip command in the program, the axis condition is controlled by the skip condition determination means and the axis control means provided in the above device. Since the movement is stopped, there is an effect that the contact type detector can be prevented from being damaged due to an error in creating a program or an error in mounting the object to be measured.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a numerical controller according to an embodiment of the present invention.

FIG. 2 is a flow chart diagram for explaining a processing procedure of a condition determination unit of the control device.

FIG. 3 is a flow chart diagram for explaining a processing procedure of a program analysis unit of the control device.

FIG. 4 is an example of a measurement program created by adding a G code for a skip function.

FIG. 5 is a schematic diagram for explaining the operation of the measurement program.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Numerical control device 2 Touch probe (contact detection means) 7 Axis control unit (axis control means) 10 Skip condition determination means Sg1 Skip signal Sg3 Skip command Sg4 Axis stop command

Claims (1)

[Scope of utility model registration request] 1. A numerical value having a skip function for executing processing by an instruction of each block of a program, forcibly stopping the processing by a skip signal input from an external contact detection means, and shifting to processing of the next block. In the control device, when the skip signal is input, skip condition determining means for determining whether or not a skip instruction exists in the block being executed, and axis movement is stopped when it is determined that the skip instruction does not exist. And a shaft control means for outputting a shaft stop command for the purpose of the numerical control device.